<html>
<head>
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
    <script src="https://cdn.bootcss.com/jqueryui/1.12.1/jquery-ui.js"></script>
    <?php
    include "db/sql.php";
    ?>
</head>
<body>
<?php
$a['one']['two']['name'] = "da";
$b['two']['three'] = "xiao";
$a['one']['two'] = array_merge($a['one']['two'],$b['two']);
print_r($a);
?>
</body>
</html>